High potential transformer



July 26, 1932. E. WELTER HIGH POTENTIAL TRANSFORMER Filed July 22, 1930Patented July 26, .1932

UNITED STATES P A TENT QFFICE EDUABD WEL'IEB, OI DBESDEN', GERMANY,ASSIGNOR TO KOCH &"STERZEI| AKTIEN GESELLSCHAI'T, OF DRESDEN, GERMANY, AGERMAN COMPANY HIGH POTENTIAL TRANSFORMER Application filed July 22,1980, Serial Roi 469,812, and in Germany July 27, 1929.

M invention relates to transformers and particularly to those of theclass used in the measurement of hi h potentials in which the highpotential winding comprises aplurality of interconnected coil ordisc-shaped winde ings arranged in the form of a layer or layerssurrounding the tubular partof the'spool and has for its object toprovide a spool such, for exam is, as that described in thespecification F. J. Fischer application No. 446,622, filed the 23rd ofApril 1930, about which the high potential winding, formed independentlyof the spool and prior to assembly, can be arranged.

A constructional form of the invention is illustrated by way of examplein the accompanying drawing.

The spool surroundin the iron core 13 and the secondary win ing 14consists of two insulating bodies 110, 111 which, while being referablycircular, may be of any other esired shape. Each of these bodies isprovided at one end with a preferably annu ar flange 110, 111respectively in suc manner that when the bodies are telescoped onewithin the other in the manner shown there is formed a spool for thehigh potential windin of the usual flanged-end type.

The igh potential winding, in .the example shown, consists of threelayers 112,

113 and 114, each of which comprises a plu-.

ralit of inter-connected coil or disc-shaped win ings 115. Theseindividual windings 115 are so arranged and connected in series thatcomplete layer windin are formed, the individual windings of eac layerbeing separated from each other by means of insulating rings 116.

At the end of each of the two outermost winding layers carrying thehighest potential there 15 provided a ea or plate 117 formed as a flangeat the en of the respective insulating cylinders 1'17 separating thewindin layers 112, 113, 114. Thus, in this way, t e creeping path or lagis augted.

If it is desired to use a transformer having a hi h potential windingand spool of the t pe erein specified in cascade the over ooup gwindings are preferably arranged in layer-wise formation over the entirelength of the spool body,

ing, the bodies may be interconnected by means of screw threads, the'lag over the securing joint being correspondingly increased. It is alsopossible to'provide a joint between the two insulating members which ispartlg inclined or stepped and partly threade v i It will thus be seenthat, with a spool of the type above described, the high potentialwinding may be formed prior to assemblin h the transformer and, afterhavin been fitte over the body of the outer mem er 111, the member 110is telescoped within said outer member and secured thereto as desired,the a spool thus formed bein for all practical purposes,

bodies are formed of suitable material, it is possible, after thewinding1 has been fitted and the joint filled in wit cementin medium, tobake said bodies'together. oreover, should said bodies be constructed ofporcelain or the like they could be secured with the aid of bindingmedium such, for example, as china-ware cement.

What I claim and desire to secure by Letters Patent of the United Statesis 1. In a high potential transformer particularly of the class used inthe measurement of high potentials, a high potentiallayerwise winding, aspool on which said winding is fitted, the winding extending over theentire axial length of the spool in such manner that its otentialincreases from the outer lying initial potential towards the coresurrounded thereb pair of preferab y tubular members each rovided-at oneend with a. flange, said mem rs said spool comprising a being telescopedone within the other to form said spool, their engaging surfaces beingsecured together.

2. In a high potential transformer particularly of the class used in themeasurement of high potentials, a hlgh potential layer-wise winding, aspool on which said winding is fitted, the winding extending over theentire axial length of the spool in such manner that its potentialincreases from the outer lying initial potential towards the coresurrounding thereby, said spool-comprising a pair of preferably tubularmembers each provided at one end with a flange, said members beingtelescoped one within the other to form said spool, their engagingsurfaces being secured together by baking.

3. In a high potential transformer particularly of the class used in themeasurement of high potentials, a high potential layer-wise winding, aspool on which said winding is fitted, the winding extending over theentire axial length of the spool in such manner that its potentialincreases from the outer lying initial potential towards the coresurrounded thereby, said spool comprising a pair of preferably tubularmembers each rovided at one end with a flange, said mem ers beingtelescoped one within the other to form said spool their engagingsurfaces being secured together by baking and being inclined withrelation to the axis of the high potential winding.

L In a high potential transformer par ticularly of the class used in themeasurement of high potentials, a high potentiallayer-wise winding, aspool on which said winding is fitted, the winding extending over theentire axial length of the spool in such manner that its potentialincreases from the outer lying initial potential towards the core sur-"rounded thereby, said spool comprising a pair of preferably tubularmembers each provided at one end with a flange, said members beingtelescoped one within the other to form said spool, and being held inthreaded engagement with each other.

5. In a high potential transformer particularly of the class used in themeasurementof high potentials, a high potential layerwise Winding, aspool on which said winding is fitted, the winding comprising aplurality of series-connected coil or disc-shaped windings forminglayers and extending over the entire axial length of the spool in suchmanner that its potential increases from the outer lying initialpotential towards the core surrounded thereby, a pair of preferablytubular members each provided at one end with a flange, said membersbeing telescoped one within the other to form the spool, their engagingsurfaces being secured together as desired.

EDUARD WELTER.

